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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabd8e36dff4bc95fc3e168cba4ddca0696461d46ef54c7c047d5a4dddac6373' 
  AND token = '+ZyQzpm5eJxwaQj4/7HlTZzoCjSaSm57cltV5g8K09I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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