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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee01de1f585663eb9b4e12636d40a8fe1be49ed10e8c06e8dd79fc2906664580' 
  AND token = 'm957l28ZSgG9kQMzo9yuywkQ0uU0abcQ4RUwr+7xOaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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