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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f503d045ca44e9adf4318ee4ca49011cabdd4690adc80ee6bc2521f467d7c2b' 
  AND token = 'R/MDJh+74H5/JBgCduOwWqlC/8k/SS98TG2uLQx2ltU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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