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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2786f92c7046f704b2592eed1897f82c81063f9b33ac61bec4ba12454749eaea' 
  AND token = 'ZPnF0UKFUUinB65Cx6AX+uvYUbkhkBfPUIOUK1varXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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