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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7eee464cc90b1d9a2f2cad0d8fa4decafae402005924a6f7762b19bef4757fb' 
  AND token = '5GvcfOD4xJxqF3eNFmslX2v2VhicwJMHz5hwvcX19yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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