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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec11873f6fad8ec740908b612c9dfe755fd47717b24340281834df67a29c2996' 
  AND token = 'XL4FJsPSyrN4armGt1d1zdJ0NAuEyP6eGUo80JJlJl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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