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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58826a43bbd992c36430c9c53626d958025468e7b034a0e0fb934e2673a5e122' 
  AND token = 'TKY9RHu4n0yT6DqPF6fqOdwO9y1Rgh/Xad/kzOmJ8hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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