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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8362ec528f7b6ee05c10c45e7f5056e40f454f53ac3054ef13d5cf6b14454b3a' 
  AND token = 'QOGwSDiARo+LdCO66LcK8x/13DqSpHiu+6oIT1KHWeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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