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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02059b71a9e8e3ed4bd46d5c1d4d87e3c5b4d546715b2ab0d7d5d143ea676374' 
  AND token = '+8PaAyTY23XbK+0fVGdEM14iqv6PgNK9wa8xf3p5vEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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