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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7d73a237a3b938e7a8d4ee706905dcefa7700e8bf894aea7059b32b071fc3e' 
  AND token = 'cO/6Ug1uCF3ZremZDUyCHvzAbyHL2tbacpmb75YcX/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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