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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ce2bd7e107e710b6a9ebfb5ffaee6cb6bf32fb95f4d4372e4ec9c55ba5b091' 
  AND token = 'XpmlURkLLQdNq3TxR2oOioYlUZ2zngw/DhkpN5wI/Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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