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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd755fc46574e7b2dac92d97f7cce5a5bed75e19a7f4ac1aa1278be6d5f218ed' 
  AND token = '70payvtZ4rgmjI7UncsE9uJueqwE9Lq0jNs24CYPDrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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