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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2594761fddacb1a66066d0fa313862b2159a77bf2d0f02717a541f59e149fbba' 
  AND token = 'zQNdsUdb0qVG1mcUOYAe06vaLwVZTimzj1b8kLhu7HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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