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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd6a53a48f7c2d39f90464b703a5a5186234c0e010c32ecc09ece91a89a4e8f' 
  AND token = '7BwzLDrLFM1c02vHU7qcTXjLNB3aNEnJwyC0Os8s+n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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