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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9316ccf135de00f59455b8cdf64f8fa6a0fbbe86b3493a9a516515f4b4ea05e2' 
  AND token = 'oJQyiVY83P4z7cbzGdqQcI0alK6w0NBIF2xV6FCqVyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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