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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56058e4bc496121fd2b86f0ea7d6cf136ca1582dca3263d11820e6c606da3d1' 
  AND token = 'UYdcZygv3v4RFk6U3VXtIr/b+468H8QsBbGRu/yKvHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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