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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cbce680a7afaf94a4b9a58aa4c8ba6cf55524ca60118f356571b4bcef58d3b' 
  AND token = '3d64mjb0gh9xt1W1X3yBL196Ly1aqdxoERNhhx0EDic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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