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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02aafc04068e4e516799369ca7e1e759d9e042a7e625c9a36d4405fcab79e3df' 
  AND token = 'BQ0x8/tV7OGtWumPxz0Ixu4bwelhppRuEPKwcBp0ciw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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