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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba6537b2a83ae55e77c27247e0fab8898b6a40b52f74eec9a45fba27f3f5c50' 
  AND token = 'Tsrw7mS+rmEhfPP0gDVniLRHuU8fGqAXWmcGV6AZxWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00173

JSON explain

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