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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1ce0bc81a5d5345eb127311c5434536b89eb7772b8ba389e61e52d7d7030b3' 
  AND token = 'ycLhGzMQL1UDh5X0vxaVYbZw9wKW0v/ufdNek/yY1+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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