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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'effe2defcfb25742fac3b3db3d3f054c6c6f4772f90fb65a1d93d038d8710475' 
  AND token = '9QfTByOpW1oJouNe25ZA5ga47bBmjUEazp2vM5bhsAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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