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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097803a55a5f44ec28931aa37c62afcabb9ecc364aff429ee75569f21be10ccd' 
  AND token = 'E4jPd34eCMbGCDvK2H6TP2632E1awdb4VV/9Ri45wrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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