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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb054c1be765b52bc9ed509dd2644c6dc791bb6a6e49bba231c5cf7d88f9ddfa' 
  AND token = 'vmcdbNVxdJ0WLMuakEBd2BOQTpjf5lBmlMHt8jgY+rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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