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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c61451e2b52650b1b2e2f5ad6ba391e34af408a09516277450a065019184bce' 
  AND token = 'b+s965oNF27UXdc3/doJWdTDc4wqtjX5E0YcsirxY/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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