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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ac5f9f41460652217db479a9d3d5d0474c77ee53fbde6cf0566ecb85abebf1' 
  AND token = 'iVDa0z9tGJMR2RnyiN9qqEARvx0BZazrv/J+LSvTGhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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