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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b872583e6a6c6aaa89be06762f69b84593396d527d59b299ed9ee8e8c534a99' 
  AND token = 'hQtAFAXpvoDuk9DxsX0fdcSWsXY6SUQpj/93vM9Z6no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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