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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b756b46a04d4d254d8a0250e29da7261223a35770e49f6931ee3ad182214a9a' 
  AND token = 'X7GqL+LmWHkgo8AZ8ajV6BVoQ7He0m662kuXp0CjZ7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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