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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1287fdbf88547b1e92cd117f61204398f4f6259ff75e7ef48d0746d9b6ffb051' 
  AND token = 'CWwjuGKXbisshhvttKT8NpvP6/MxoRi6o8INI4XyVTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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