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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984e74ae52c7b09347cfc9dd4833795b2625f7c3f7ad9469714152248ea554bf' 
  AND token = 'Lv0RJdjH14uyttu09PcfP+Xmi58E7ZVBI1apoDogC+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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