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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64ac5189f51c0d7d7c8383230e795bca769242a8902cba25691ec76babb2b4d' 
  AND token = 'lJZ+0P8grheizqhKw6oCW1FIUt0r23wXJiypEOEShEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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