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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b2dc2090f7116cbddef0db41e0f4cfd3ea050899e166e98805322d343aa3d6' 
  AND token = 'Ue0KcnJgSFE7Ie4TDcyrebKXI1S8Rdfmqt3o53tDQUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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