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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7654112e1af4b34682180cfe9eeaf105e1c418a9aa3a9ddd1fb31ea6887b4159' 
  AND token = 'nzA07jnM8WT48KfUumz7kMN8kasgNceUxI4dmEhVlZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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