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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8e3afe47c144d06c984e25305e582f337381ae3a8a5cf1f30ac7f52f164972' 
  AND token = 'x1+noWP5h/0sH1PzguOQb7FhOaeCXTS6KdB+FGjNBdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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