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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dae9944603310ec5759dc782b116995c2ade64ca4087ef08a189d26045992ba' 
  AND token = 'hUAaGNg6/gwcQTbzrwtso0sDV562avVI4pGPt0PiiKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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