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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '366c96d28ccd7821ab7564bdc84d9a01c8d9ec49f29672018d33c0e4ffe9eded' 
  AND token = 'z408roeybxPKhKh51UcwpJQR3DRD3fc6erlqM8m0hxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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