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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432f3f6ba4c501a589903cabbb10aa777be13bad9edaf467bcd5bb1d8f234cb5' 
  AND token = 'i0pMtPPj5XPR9F1JS3t5Wv9vwHJ/v04/lY77CEcy6Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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