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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea0c924828951f0156e70c54309e9f438141fdb444e4496c48d6ae790bc0c87' 
  AND token = '2rh3bspKPC/9rXjhRKU21NMJwkVQ+i39/6xm1Q7aAXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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