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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08761b5c5622e5100befc58c753154cfb3b3dbc0c6ca7be3f43821f87377528a' 
  AND token = '2ihizHBFabvY3PcjpQZNlVlzUihDDe4IVlq7zYYu2fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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