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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632a7caad144173b0d40eaa7f6759a79abb2598278442eca496b26d4052688aa' 
  AND token = 'qJn4x81wFgf9LFeE1JtmUnSD2eYpKAmqLDpIM03NGM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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