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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c63e59450eb2426e914897605c730a9eb920d725e846bc19324f22843485f2b' 
  AND token = '8SpXu29lXt6S5AWol1XZuQyTOpB1AKrTPb+cWg20Mdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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