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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d3ec5c4fc910d15c49312d5b9861b1fdecb626a7ce096dec5e0c656a9c6ee3' 
  AND token = 'r+vEt76iDHYM6xClBChkCdlcf5QSIreuVH42bjBbHiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}