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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9de9c0fd07be2b2503837c9c83e3d808394dec0c1ef9b7f5beec8da8fa14db7' 
  AND token = 'fEIJvVOWv19y16mvIrKHQNP64HGXSf48PUrMBSbPII4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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