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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb265ba1de436d57b03578f7ffc6bdd07d881311042a325918f63fd650122b0' 
  AND token = '7jhitpuRNYKaJ1ayQh7oS+sGLmqs04ZrNwEioieS+qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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