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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73a262fdd97e19d71f55079960f55cff9c7e71ef9ada8973119dde861b15e3c' 
  AND token = '9D/DiFTbSaXVLt+J2OgoNdk7dG4scFtpJl197cFg6tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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