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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d61f809c9e117be95f20c75c024dbc14ccad00d52fe6ced3e8eb1e46d19ebb7' 
  AND token = '3foGaFZTMiqRuAAxq2xzm6BFDPE3d4NsGUla499ONJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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