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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90e1f10112b0780849f1fc2d5af9db57062f6f42bd9849025615cfdf73e087b' 
  AND token = 'v4vhKfC0kb3Ta9H4QuZTFxZg1uAu9j5B6EfPHzv9rvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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