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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d19fd5c90997a651c50323c718c0b8b0b8a3aa363ee6bee27aa1db6a73b133d' 
  AND token = 'HGbC2s3EX4/qfvhYrl6dsyXNHbDKxiyMDEYwqADueq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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