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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d82cd2ea2a5beb4922839d4e4a8b7c9512aa308694d3344305789327d32e06' 
  AND token = 'odJSjEV4RMz3AwGiAVM96C++wL4zU+9tSR2rNNnkMN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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