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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea765fc4c4ce78e573af7ce0b671674d1aca0e8b4fe72e0f016c18e62a12da4' 
  AND token = '6Zm2yr7hkdII204CC09VhLadQOVJ7b9NXFuzYTXxQHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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