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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec94ccffdd5cbc10b5eaf2ef9b8bdc3f8d3a614ce4578cf0958c44ba2d1053b' 
  AND token = 'diGpgXf9fudyzHR5A9yRz1SUZaUcazTG8VF+4hwTBxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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