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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3ff73b5bf7bad0ba3facabc26b98d4494b6f537beb2b6f73047042353dd8db' 
  AND token = 'gQALYoN/X81LX1TlWQjm3u5wwfiGH1T2Z0OTH5dHxMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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