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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707db9b86924763dcd0ad4367875eda448859fb427c94f8d144e077b5f488e17' 
  AND token = 'n4udjoKlv2eltDArPhbQoiUFUhXk0x9DUDpAlT1Sr8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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