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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad6d81bc3814ea4716b30a6cb8d3a907cf8ae06c7615505431ed4c0789242d8' 
  AND token = '0N1aEcU6aW4epnigSExba6aL1tC8k3JNlfEWCjSL93A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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