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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dae841b394b738cf7ffe3a49fff14e378b007969ec3443938f1ffd98879d0f8' 
  AND token = 'aGzyB8EiZj8FS44L++YDKZ0qFj6SjgT7di6GgMX8N1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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