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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc569f482f7847968709cdf05a1a8d1d78d04bd627c4850da599fdca2844c5d' 
  AND token = '3EyZktQO1jlGIPDAstyle/NK5TrABELqo0konHAsbuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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