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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530c9f82683e78a1d2f0d6c4440f6529c8304aca801f6de413ca8f69a42078b6' 
  AND token = 'Wm3Xo4hj5RkrVHaPOFx4zPEQ87CNTg1kitKFHCB35C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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