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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8779dab50e7ca83a0e9e435ab6d232fc8d73abfdc791eba7c436bb5fd08a2cc' 
  AND token = 'GTq53icAmaBfziHYgkM6xQncCBwS7yIhX+CBfVUA4gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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