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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8531a8468f1785199a9378212414ee58052b7ebb5f36fb6c85cb51d76876018' 
  AND token = 'F3kcvZQdVO72sWk7Hd1tv23O12T/P5FfaRDfMayv7SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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