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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d8c8e9401be696a38d5c189a478364c232fafe01b9fd8419c0f33b438ab29b' 
  AND token = 'zxec8FyHEN4/j70dlb150r2pfayPoVTPUpVnmIIeo0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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