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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d6f570b93865761e093112235c22abacdbd8ef33a35c826eeabf968ab3ac9f' 
  AND token = 'Zo5I2R7PTvngKRvw3zoxFD7PQ8NteBpZ0AOVcBkefj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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