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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42f5b7f8c4f340f25ed50b465793839a4d4e871d217a0209e0b6edaa8f3b001' 
  AND token = 'Evx99I1NLcd2R/rAPYdDUlFvb84rVMndb+JFtn2lmy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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